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I get exactly zero difference in mileage if I fill at 3/4 tank or 1/4 tank. I've never gone below 1/4 tank. I also fill at a station where I can glide down to 15-20 MPH with minimal interference to other people. And that station is 39 miles from home, so I can top off the tank without concerns about heat expansion causing overflow.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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